Create a new shell in a new console window. This window will become
the active one. The new shell inherits most attributes of the parent
shell like the current directory, stack size, prompt and so on.
However, it is completely independent of the parent shell.
The window belonging to the new shell may be specified by
using the WINDOW keyword.
WINDOW -- Specification of the shell window
X -- number of pixels from the left edge of
Y -- number of pixels from the top edge of
WIDTH -- width of the shell window in pixels
HEIGHT -- height of the shell window in pixels
TITLE -- text to appear in the shell window's
AUTO -- the window automatically appears when the
program needs input or output
ALT -- the window appears in the specified size
and position when the zoom gadget is clicked
BACKDROP -- the window is a backdrop window
CLOSE -- include a close gadget
INACTIVE -- the window is not made active when opened
NOBORDER -- the window is borderless, only the size,
depth and zoom gadgets are available
NOCLOSE -- the window has no close gadget
NODEPTH -- the window has no depth gadget
NODRAG -- the window cannot be drag; implies NOCLOSE
NOSIZE -- the window has no size gadget
SCREEN -- name of a public screen to open the window on
SIMPLE -- if the window is enlarged the text expands to
fill the available space
SMART -- if the window is enlarged the text will not
WAIT -- the window can only be closed by selecting
the close gadget or entering CTRL-\.
FROM -- File to execute before resorting to normal shell
operations. If nothing is specified S:Shell-Startup